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Income Taxes - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2020 USD ($)
Income Taxes [Line Items]
Net deferred tax asset	$ 0
Federal [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 196,960,000
Net operating loss carryforwards expiration year	2025
Net operating loss carryforwards expiration year	2036
Net operating loss carryforwards, indefinitely	$ 24,000,000
Foreign [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	61,781,635
2025 Through 2027 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	47,000,000
2028 Through 2037 [Member]
Income Taxes [Line Items]
Net operating loss carryforwards subject to expiration	$ 126,000,000

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- Definition

Income taxes.

+ References

No definition available.

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- Definition

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+ References

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- Definition

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X

- Definition

Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates.

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